Heat transfer parameters in fixed bed exchangers

Abstract

Heat transfer parameters were measured in fixed bed exchangers containing alumina catalyst particles with particle diameter d p = 3.1 × 10 −3 m. Different tube diameter (d t ) to particle diameter ratios were used, ranging from 3 to 18. Radial temperature profiles were measured at various axial positions. Results were analysed on the basis of a pseudohomogeneous unidimensional model leading to an overall wall heat transfer coefficient h w , which showed a maximum value at d t /d p ≈ 6. Experimental results were also analysed by means of a pseudohomogeneous bidimensional model from which the wall heat transfer coefficient α w and the effective radial thermal conductivity κ er were calculated as a function of the particle Reynolds' number.